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EP0011751B1 - Procédé pour la fabrication de matières plastiques expansées renforcées - Google Patents

Procédé pour la fabrication de matières plastiques expansées renforcées Download PDF

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Publication number
EP0011751B1
EP0011751B1 EP79104409A EP79104409A EP0011751B1 EP 0011751 B1 EP0011751 B1 EP 0011751B1 EP 79104409 A EP79104409 A EP 79104409A EP 79104409 A EP79104409 A EP 79104409A EP 0011751 B1 EP0011751 B1 EP 0011751B1
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EP
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Prior art keywords
polyols
fillers
organic
parts
weight
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EP79104409A
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German (de)
English (en)
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EP0011751A1 (fr
Inventor
Matthias Dr. Dipl.-Chem. Marx
Dietmar Dr. Dipl.-Chem. Nissen
Wolfgang Dr. Dipl.-Chem. Jarre
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BASF SE
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BASF SE
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
    • C08J2375/04—Polyurethanes

Definitions

  • the invention relates to a process for the production of reinforced, foamed plastics based on organic polyisocyanates and polyols in the presence of filler dispersions, which are produced by in situ comminution to particle sizes smaller than 7 11 m of organic and / or inorganic fillers in polyisocyanates or polyols will.
  • polyurethane plastics with various physical properties by reacting compounds with several active hydrogen atoms, in particular polyhydroxy compounds, with polyisocyanates, optionally with the use of polymers as reinforcing agents, chain extenders, crosslinking agents, blowing agents, activators, emulsifiers and other additives.
  • polymers as reinforcing agents, chain extenders, crosslinking agents, blowing agents, activators, emulsifiers and other additives.
  • both elastic and rigid foams, paints, impregnations, coatings or elastomers can be produced in this way.
  • the viscosity of the polymer-polyol mixtures used plays an important role in the production of polyurethane plastics. This applies in particular to the production of polyurethane foams, in which the polymer-polyol mixture must be pumped and metered perfectly and must be homogeneously and as quickly as possible mixed with the isocyanate component and additives such as activators, emulsifiers, water and / or blowing agents in mixing chambers . For this reason, the lowest possible viscosities are desirable in the production of polyurethane foams.
  • Highly viscous polymer-polyol mixtures are used for processing e.g. B. on high pressure foam machines, no longer usable.
  • flexible polyurethane foams are produced from polyisocyanates and a polyether polyol, which is a polymer in latex form with a particle size of 0.1 1 1m to 1 1 1m in an amount of 2 to 50 percent by weight, based on the polymer -Polyol blend contains and wherein the polymer is obtained by polymerizing one or more ethylenically unsaturated monomers which are free of groups which can react with isocyanate or hydroxyl groups under urethane formation conditions.
  • a disadvantage of this process is that the mechanical properties, in particular the tensile strength, of the flexible foams produced in this way are unsatisfactory.
  • the solids content of the aqueous polymer dispersion is extremely low, so that high process costs are associated with dewatering.
  • colloidal pigment materials are prepared using a liquid polyhydric alcohol from the group of hexane and octane triols or tetrols by kneading or rolling a plastic mass of pigment, a carrier, e.g. B. gelatin and the polyhydric alcohol in a kneading machine.
  • a carrier e.g. B. gelatin and the polyhydric alcohol in a kneading machine.
  • the prior art also includes processes in which inert fillers of an organic or inorganic type are used in one of the foaming agents Starting components or directly into the foaming mixture, for example in the mixing chamber of the foaming machine. But these processes also have serious disadvantages.
  • inert fillers of an organic or inorganic type are used in one of the foaming agents Starting components or directly into the foaming mixture, for example in the mixing chamber of the foaming machine.
  • these processes also have serious disadvantages.
  • the risk of sediment formation is always very pronounced, which has led to the fact that such dispersions always have to be stirred more or less intensively to avoid difficult redispersion processes.
  • polymers or inorganic fillers are stirred into polyether polyols in the presence of emulsifiers or dispersing agents (DE-A-2 457 727 and 2 654 746).
  • emulsifiers or dispersing agents DE-A-2 457 727 and 2 654 746.
  • Such dispersions are also often not sufficiently stable in storage and must therefore be constantly stirred during processing.
  • Potentially unstable dispersions react particularly sensitively if they are mixed with other structural components to form a polyol component A which can be processed with polyisocyanates and are used in the two-component process.
  • the auxiliaries contained in the dispersion can adversely affect foam production.
  • the inorganic fillers are mixed with special polyhydroxy compounds which are prepared by grafting olefinically unsaturated carboxylic acids onto polyhydroxyl compounds. It is also disadvantageous here that the graft polyols suitable as dispersing medium have to be prepared in a separate process step.
  • Polyurethane foams filled with heavy spar are used for special purposes of sound and heat insulation.
  • the raw materials must be processed using specially designed machines, especially those that work on the principle of low pressure technology and with agitator mixing.
  • the object of the present invention was to produce reinforced, foam-shaped plastics from filler-containing foamable polyisocyanate-polyol systems, which can be processed in technically desired filler concentrations on high-pressure machines in rapidly reacting batches without retrofitting the machine.
  • This object was achieved by a process for the production of reinforced foamed plastics based on organic polyisocyanates, polyols, finely divided dispersions of fillers, blowing agents, catalysts and, if appropriate, chain extenders and additives, which is characterized in that finely divided dispersions of fillers which are used by in situ comminution with local energy densities of 10 to 3000 kWh / m 3 to particle sizes of less than 7 11 m and simultaneous dispersion of organic and / or inorganic fillers in polyols with molecular weights of 200 to 8000 or organic polyisocyanates.
  • Soft-elastic and semi-hard polyurethane foams are preferably produced by the process according to the invention.
  • hard polyurethane foams and integral foams and polyisocyanurate foams can also be obtained using the finely divided filler dispersions.
  • the method according to the invention has numerous advantages.
  • the in situ comminution of the fillers to particle sizes of less than 7 1 1 m and simultaneous dispersion in polyol results in stable dispersions which have no sediment after more than 6 months of storage.
  • the filler-polyol dispersions can be processed on conventional low and high pressure machines.
  • the line systems are not clogged and the control units are not blocked; abrasion was not observed even under production conditions, in contrast to known filler dispersions.
  • Advantages of high pressure machines such as product savings, Environmental cleanliness, since no detergent is used, and increased production speed can be used.
  • the process according to the invention regulates the open-cell structure, increases the load-bearing capacity and elasticity, without the stretchability and tensile strength being impaired thereby.
  • an increase in tear strength was surprisingly observed.
  • the filler polyol dispersion made it possible to adjust the open cell in a targeted manner.
  • an increase in the modulus of elasticity and an improvement in the coefficient of thermal expansion were found for higher-density, microcellular materials. Because of the considerable differences in the expansion coefficients, it is difficult to use metal and plastic parts next to one another as construction materials, even if this would be desirable in many cases for reasons of weight saving and reduction in production costs. This is made possible in many cases by the method according to the invention.
  • Toluene diisocyanates diphenylmethane diisocyanates, mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates (raw MDI), mixtures of tolylene diisocyanates and raw MDI, polyisocyanates modified with polyhydroxyl compounds and polyisocyanates containing isocyanurate rings are preferably used.
  • the polyols used in the process according to the invention are preferably customary linear and / or branched polyesterols and in particular polyetherols with molecular weights of 200 to 8000, preferably 800 to 6000 and in particular 1800 to 4500.
  • polyetherols with molecular weights of 200 to 8000, preferably 800 to 6000 and in particular 1800 to 4500.
  • other hydroxyl-containing polymers with the molecular weights mentioned, for example polyester amides, polyoxymethylenes and polycarbonates, in particular those prepared from diphenyl carbonate and 1,6-hexanediol by transesterification, are also suitable.
  • the polyesterols can be prepared, for example, from dicarboxylic acids, preferably aliphatic dicarboxylic acids, having 2 to 12, preferably 4 to 8, carbon atoms in the alkylene radical and polyhydric alcohols, preferably diols and triols.
  • dicarboxylic acids preferably aliphatic dicarboxylic acids, having 2 to 12, preferably 4 to 8, carbon atoms in the alkylene radical and polyhydric alcohols, preferably diols and triols.
  • examples include aliphatic dicarboxylic acids such as glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid and preferably succinic, glutaric and adipic acid and aromatic dicarboxylic acids such as phthalic acid and terephthalic acid.
  • dihydric and polyhydric, in particular dihydric and trihydric alcohols are: ethylene glycol, diethylene glycol, 1,2- or 1,3-propylene glycol, dipropylene glycol, decanediol-1,10, glycerol, trimethylolpropane and preferably 1,4-butanediol and Hexanediol-1,6.
  • the polyesterols have molecular weights from 800 to 5000, preferably from 1000 to 3000 and hydroxyl numbers from 25 to 170, preferably from 40 to 110.
  • Polyetherols are preferably used which are prepared by known processes from one or more alkylene oxides having 2 to 4 carbon atoms in the alkylene radical and a starter molecule which contains 2 to 8, preferably 2 to 4, active hydrogen atoms.
  • Suitable alkylene oxides are, for example, tetrahydrofuran, 1,3-propylene oxide, 1,2- or 2,3-butylene oxide, styrene oxide and preferably ethylene oxide and 1,2-propylene oxide.
  • the alkylene oxides can be used individually, alternately in succession or as mixtures.
  • dicarboxylic acids such as succinic acid, adipic acid, phthalic acid and terephthalic acid
  • primary amines and optionally N-mono-, N, N- and N, N'-dialkyl-substituted diamines having 1 to 4 carbon atoms in the alkyl radical, if appropriate mono- and dialkyl-substituted ethylenediamine, 1,2- or 1,3-propylenediamine, 1,4-butylenediamine, 1,6-hexamethylenediamine, 4,4'-, 2,4'- and 2,2'-diaminodiphenylmethane and 2 , 4- and 2,6-tolylene diamines, alkanolamines, such as ethanolamine, diethanolamine, N-methyl- and N-ethyl-diethanolamine and triethanolamine, hydrazine and preferably polyhydric, especially di- and trihydric alcohols, such as ethylene glycol,
  • dicarboxylic acids
  • Essentially linear and trifunctional polyetherols with molecular weights from 200 to 8000, preferably from 800 to 6000 and particularly from 1800 to 4500 and hydroxyl numbers from 15 to 800, preferably from 25 to 200, are preferably used, which contain both ethylene oxide and 1,2-propylene oxide units contained in the oxyalkylene chain, which may be arranged either randomly or in blocks in the oxyalkylene chain.
  • Polyetherols which preferably have primary hydroxyl groups, are used in particular.
  • the polyols used can have a hydroxyl number, which can vary within a wide range. Generally, the hydroxyl numbers of the polyols used in the present invention are within the range of about 15 to about 800 and above, preferably about 25 to 200, and most preferably about 25 to about 45.
  • the hydroxyl number is defined as the number of mg of potassium hydroxide required to complete Hydrolysis of the fully acetylated derivative made from 1 g polyol is required.
  • the hydroxyl number can also be defined by the following equation: in which means:
  • the molecular weight or the hydroxyl number is suitably selected so that flexible, semi-hard and hard foams are obtained.
  • the polyols preferably have a hydroxyl number from about 200 to about 800 when used for rigid foams, they have a hydroxyl number from about 30 to about 150 for the production of semi-hard foams and from about 20 to about 70 or more when used to make flexible foams.
  • the present invention is by no means restricted by these limits, but rather serves only to explain the large number of possible combinations of the polyols mentioned.
  • An essential feature of the present invention is the co-use of fillers for the production of the foamed, reinforced plastics, namely in the form of finely divided dispersions, which are reduced by in situ comminution with a high local energy density to particle sizes of less than 7 11 m and simultaneous dispersion of organic and / or inorganic fillers in the above-mentioned polyols or organic polyisocyanates as a dispersing medium.
  • inorganic fillers such as the conventional fillers, reinforcing agents, weighting agents, agents for improving the abrasion behavior in paints, coating agents, etc.
  • silicate minerals for example layered silicates such as antigorite, serpentine, hornblende, amphiboles, chrisotile, talc, metal oxides such as kaolin, aluminum oxides, titanium oxides, iron oxides, metal salts such as chalk, heavy spar, barium sulfate, inorganic pigments such as cadmium sulfide , Zinc sulfide, as well as glass and asbestos flour.
  • dispersion aids in quantities of 0.005 to 10%, preferably from 0.01 to 2%, based on the weight of the filler, for the production of the filler body dispersions.
  • dispersion aids such as silicones, esters of higher fatty acids, for example mono-, di- and triglycerides of oleic acid or linseed oil fatty acids are suitable.
  • the organic and / or preferably inorganic fillers in situ in the organic polyisocyanates or preferably polyols with the aid of high local energy density to particle sizes smaller than 7 microns, preferably 0.01 up to 7 1 1m and in particular 0.05 to 2.5 11m crushed and thereby dispersed at the same time.
  • the high local energy density here means energy densities of 10 to 3000 kWh / m 3 , preferably 20 to 2500 kWh / m 3 .
  • the fillers are first crushed to particle sizes smaller than 100 ⁇ m.
  • coarse-grained materials for example on mechanical mills, such as impact plate mills, pin mills and the like. a. be ground.
  • particle sizes of less than 100 ⁇ m using physical methods, for example by reprecipitation.
  • the fillers pretreated in this way are now comminuted in the presence of polyisocyanates or polyols and optionally dispersing aids in situ to particle sizes of less than 7 ⁇ m (wet comminution).
  • the wet comminution can be carried out, for example, in mechanical dispersing devices, preferably in dispersing machines with high local energy density using grinding media, such as, for. B. agitator ball mills, sand mills, Netsch mills, Dyno mills, planetary ball mills, kettle mills and attritors.
  • grinding media are preferably spherical grinding media, for example made of glass, ceramic, metal or hard abrasion-resistant plastic, for. B. polyamide, and their diameter is between 0.2 to 8, preferably 0.4 to 5 mm.
  • the filler is mixed with the polyol as a dispersing medium in such amounts that the resulting dispersion has a filler content of 3 to 50% by weight, preferably 5 to 20% by weight, based on the total weight.
  • the total amount of filler can be mixed with the total amount of dispersing medium and optionally with dispersing aids, crushed and dispersed at the same time.
  • the entire amount of dispersing medium with a certain part, for example 10 to 80%, preferably 40 to 60% of the filler and to comminute this mixture to a particle size of the filler of 2 to 10 11 m and then the mixture incorporate the remaining amount of filler or grind a partial amount of dispersing medium with the total amount of filler in the presence of dispersing aid and add further dispersing medium and optionally dispersing aid in the course of the grinding process.
  • a certain part for example 10 to 80%, preferably 40 to 60% of the filler and to comminute this mixture to a particle size of the filler of 2 to 10 11 m and then the mixture incorporate the remaining amount of filler or grind a partial amount of dispersing medium with the total amount of filler in the presence of dispersing aid and add further dispersing medium and optionally dispersing aid in the course of the grinding process.
  • the filler-polyisocyanate and filler-polyol dispersions obtained which, with a solids content of 15% by weight at 25 ° C., have viscosities of less than 2500 cP, preferably from 1000 to 2000 cP, and are very good on conventional processing machines for producing polyurethane can be processed, if necessary, can be adjusted to the required solids content before processing with additional polyisocyanate or polyol.
  • the foamed, reinforced plastics are produced by the process according to the invention from the above-mentioned organic polyisocyanates, polyols and filler dispersions in the presence of catalysts, blowing agents and optionally chain extenders and additives.
  • Suitable catalysts for accelerating the polyurethane formation between the polyols, the water, optionally chain extenders and the polyisocyanates are, for example, tertiary amines, such as dimethylbenzylamine, N, N, N ', N'-tetramethyl-diamino-ethyl ether, bis- (dimethylaminopropyl) urea, N-methyl- or N-ethylmorpholine, dimethylpiperazine, 1,2-dimethylimidazole, 1-azo-bicyclo- (3,3,0) -octane and preferably triethylenediamine, metal salts such as tin dioctoate, lead octoate, tin diethylhexoate and preferably tin - (II) salts and dibutyltin dilaurate and in particular mixtures of tertiary amines and organic tin salts.
  • tertiary amines such
  • the usual cyclization and polymerization catalysts for polyisocyanates have proven successful for the production of polyisocyanurate foams.
  • strong bases such as quaternary ammonium hydroxides, for example benzyltrimethylammonium hydroxide; Alkali metal hydroxides, for example sodium or potassium hydroxide; Alkali metal alkoxides, for example sodium methylate and potassium isopropylate; Trialkylphosphines, for example triethylphosphine; Alkylaminoalkylphenols, for example 2,4,6-tris (dimethylaminomethyl) phenol; 3- and / or 4-substituted pyridines, for example 3- or 4-methylpyridine; metal-organic salts, for example tetrakis (hydroxyethyl) sodium borate; Friedel-Crafts catalysts, for example aluminum chloride, iron (III) chloride, boron fluoride and zinc chloride and alkali metal salts of weak organic acids
  • N, N ', N "-Tris- (dialkylaminoalkyl) -s-hexahydrotriazines are preferably used, for example the N, N', N" -Tris- (dimethylaminopropyl) -s-hexahydrotriazine.
  • the suitable amount of catalyst for producing the polyurethane plastics according to the invention depends on the effectiveness of the catalyst in question. In general, it has proven advantageous to use 1 to 15 parts by weight, preferably 3.5 to 10 parts by weight, of catalyst for every 100 parts by weight of organic polyisocyanate.
  • Blowing agents which can be used in the process according to the invention include water which reacts with isocyanate groups to form carbon dioxide.
  • the amounts of water which can expediently be used are 0.1 to 3%, based on the weight of polyisocyanate. If necessary, larger quantities of water can also be used.
  • blowing agents that can be used are low-boiling liquids that evaporate under the influence of the exothermic polymerization reaction.
  • Liquids which are inert to the organic polyisocyanate and have boiling points below 100 ° C. are suitable.
  • halogenated hydrocarbons such as methylene chloride, trichlorofluoromethane, dichlorodifluoromethane, dichloromonomofluoromethane, dichlorotetrafluoroethane and 1,1,2-trichloro-1,2,2-trifluoroethane. Mixtures of these low-boiling liquids with one another and / or with other substituted or unsubstituted hydrocarbons can also be used.
  • low-boiling liquid for the production of foamed polyurethane masses depends on the foam density that is to be achieved and, if appropriate, on the use of water. In general, amounts of 5 to 40 percent by weight based on 100 parts by weight of organic polyisocyanate give satisfactory results.
  • chain extenders in addition to the higher molecular weight polyols to produce the foamed, reinforced plastics.
  • the chain extenders have molecular weights less than 2000, preferably from 30 to 600 and preferably have two active hydrogen atoms.
  • aliphatic and / or aromatic diols with 2 to 14, preferably 2 to 6 carbon atoms such as propanediol, pentanediol, 1,6-hexanediol and preferably ethanediol, 1,4-butanediol and bis- (2-hydroxyethyl) hydroquinone are suitable .
  • Diamines such as ethylenediamine and optionally 3,3'- or 3,3 ', 5,5'-di- or tetrasubstituted 4,4'-diaminodiphenylmethanes
  • ethanolamines such as triethanolamine and polyhydroxyl compounds, such as glycerol, trimethylolpropane and low molecular weight hydroxyl-containing Polyalkylene oxides from the aforementioned starting materials.
  • Additives can also be incorporated into the reaction mixture.
  • examples include surface-active foam stabilizers, hydrolysis protection agents, pore regulators, fungistatic and bacteriostatic substances, dyes, pigments and flame retardants.
  • surface-active substances are considered which serve to support the homogenization of the starting materials and, if appropriate, are also suitable for regulating the cell structure of the foams.
  • examples include siloxane-oxyalkylene copolymers and other organopolysiloxanes, oxyethylated alkylphenols, oxyethylated fatty alcohols, paraffin oils, castor oil or castor oil esters and turkish red oil, which are used in amounts of 0.2 to 6 parts by weight per 100 parts by weight of polyisocyanate.
  • Suitable flame retardants are, for example, tricresyl phosphate, tris-2-chloroethylphosphate, tris-chloropropylphosphate and tris-2,3-dibromopropylphosphate.
  • inorganic flame retardants such as antimony trioxide, arsenic oxide, ammonium phosphate and calcium sulfate, can also be used to flame retard the polyurethane foams.
  • inorganic flame retardants such as antimony trioxide, arsenic oxide, ammonium phosphate and calcium sulfate.
  • the filler-polyol dispersions can be diluted with the abovementioned polyols to produce the reinforced, foamed plastics by the process according to the invention and thus adjusted to the required, advantageous filler content.
  • the polyisocyanates and polyols or mixtures of polyols and chain extenders are reacted in such amounts brought that the ratio of OH: NCO groups is 1: 0.8 to 2.5, preferably 1: 0.9 to 1.2, in particular approximately 1: 1 and the filler content in the foamable mixture 0.5 to 15 % By weight, preferably 1 to 10% by weight, based on the weight of the polyisocyanate-polyol mixture.
  • water is also used as a blowing agent
  • the ratio of NCO groups of the polyisocyanate to Zerewitinoff-active hydrogen atoms - bound to polyol, optionally chain extender and water - is advantageously 0.8 to 2.5, preferably 0.9 to 1.2.
  • the filler content is 0.5 to 15% by weight, preferably 1 to 10% by weight, based on the total weight of polyisocyanate and polyol.
  • the reinforced foamed plastics are produced by the prepolymer and preferably the one shot process.
  • the polyisocyanates are mixed with the filler-polyol dispersions or polyols, catalysts, blowing agents and optionally chain extenders and additives in the proportions mentioned at temperatures from 0 to 50 ° C., preferably 15 to 40 ° C., and the reaction mixture is then left in Foam open or closed molds.
  • the free-foaming polyurethane foams produced according to the invention have densities of 10 to 300 g / liter, the flexible polyurethane foams having densities of 10 to 60 g / liter, the semi-rigid foams having densities from 60 to 130 g / liter and the integral polyurethane foams having densities of 60 up to 300 g / liter.
  • the polyurethane foams are particularly characterized by their high degree of open cells and good compression hardness.
  • the products are preferably used as upholstery foams, also for safety covers and for shoe soles, armrests, neck supports, seat cushions and the like. a. used.
  • the polyisocyanurate foams have densities of 5 to 100 g / liter, preferably 10 to 50 g / liter. Due to their excellent insulating properties, they are particularly suitable for double-band elements.
  • the speed of the ball mill was chosen so that the local energy density was approximately 1500 kWh / m 3 and a temperature of 35 ° C.
  • the dispersion was then removed from the mill and a sedimentation analysis was carried out. It was found that 95% of the particles contained in the dispersion were smaller than 1 ⁇ m and 50% of the particles were smaller than 0.5 ⁇ m. The storage-stable dispersion did not show any sedimentation after more than 6 months.
  • Sedimentation analysis of the dispersion obtained showed that less than 1% by weight of the particles were larger than 3 ⁇ m, approximately 80% by weight of the particles were approximately 1 ⁇ m and 20% by weight of the particles smaller than 0.5 ⁇ m. The dispersion did not show any sedimentation after 4 months.
  • talc flour 200 parts of a commercially available talc flour with an SiO 2 content of 62.6% by weight, MgO of 31.4%, Al 2 O 3 of 0.20% by weight, Fe 2 O 3 of 0.10% by weight. -%, water of 4.8 wt .-%, a density of 2.77 g / cm 3 and a grain size of about 60 microns
  • the total duration of the grinding process was 5 hours, the local energy density was approximately 600 kWh / M 3.
  • a sedimentation analysis of the dispersion obtained showed that 92% of the particles had a diameter of less than 3 ⁇ m.
  • the polyurethane foam obtained has the following mechanical properties
  • Example 5 and the associated comparative example show that the load-bearing capacity of the polyurethane foam was increased by the addition of the filler-polyetherate dispersion and at the same time the tensile strength and tear propagation resistance were improved. The rest of the property profile remains practically the same
  • the polyurethane foams produced by the process according to the invention show a significantly improved elongation at break, tear resistance and compression hardness.
  • a prepolymer containing isocyanate groups 100 parts of a polyester polyol based on adipic acid, diethylene glycol and trimethylolpropane with an average functionality of 2.6, an OH number of 50 to 55 and a viscosity, measured at 75 ° C., of 1300 mPas are used a mixture of 162.57 parts of 4,4'-diphenylmethane diisocyanate and 37.51 parts of a commercially available carbodiimide-modified 4,4'-diphenylmethane diisocyanate was reacted at a temperature of 80 ° C. in 2 hours.
  • An isocyanate-containing, carbodiimide-modified prepolymer with an NCO content of 19.8% by weight and a viscosity of 2400 mPas at 20 ° C. is obtained.
  • Component A and component B are heated to 23 ° C. and mixed intensively in the weight ratio 100: 92 for 10 seconds and poured into an aluminum mold heated to 45 ° C.
  • the start time is 18 seconds, the rise time is 45 seconds.
  • the free-foaming foam has a bulk density of 68 g / l.
  • the molded part can be removed from the mold after 3 minutes.
  • the surface is very smooth and non-porous; the part does not shrink and has a very even, fine-cell foam structure in the core zone.
  • Component B corresponds to that of Example 9.
  • Components A and B are heated to 23 ° C. and mixed intensively in the weight ratio 100 91 for 10 seconds and poured into an aluminum mold heated to 45 ° C.
  • the start time is 18 seconds, the rise time is 45 seconds.
  • the free-foaming polyurethane foam has a bulk density of 80 g / l.
  • the molded part can be removed from the mold after 5 minutes.
  • the edge zone has a slight orange peel structure, the molded part begins to shrink slightly after cooling and shows a relatively coarse, irregular cell structure in the core zone.
  • Example 9 shows that the addition of filler improves the foam morphology, prevents shrinkage and causes a significant increase in the compressive stress in the case of greater compression (60%).

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  • Inorganic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)

Claims (8)

1. Procédé pour la fabrication de matières plastiques expansées renforcées à base de polyisocyanates organiques, de polyols, de matières de charge finement dispersées, de catalyseurs, d'agents d'expansion et eventuellement d'agents d'allongement des chaînes et d'autres additifs, caractérisé en ce que l'on emploie des dispersions finement divisées de matères de charge, préparées par une réduction in situ, sous des densités d'énergie locales de 10 à 3000 kWh/m3, à une granulométrie inférieure à 7 µm, et une dispersion concomitante de matières de charge organiques et (ou) inorganiques dans des polyols avec des poids moléculaires de 200 à 8000 ou des polyisocyanates organiques.
2. Procédé suivant la revendication 1, caractérisé en ce que la granulométrie est choisi entre 0,1 et 7 µm.
3. Procédé suivant la revendication 1, caractérisé en ce que les matières de charge utilisées sont des matières inorganiques.
4. Procédé suivant la revendication 3, caractérisé en ce que les matières de charge inorganiques sont choisies parmi les silicates, les oxydes de métaux, les sels de métaux, les pigments minéraux, le verre, l'amiante pulvérulente et des mélanges de ceux-di.
5. Procédé suivant la revendication 1, caractérisé en ce que l'on utilise des matières de charge organiques choisies parmi le charbon et les pigments organiques.
6. Procédé suivant la revendication 1, caractérisé en ce que l'on emploie des polyols comme milieu de dispersion.
7. Procédé suivant la revendication 6, caractérisé en ce que les polyols sont choisis parmi les poly-ester-ols et(ou) les poly-éther-ols avec des indices d'hydroxyle de 15 à 800.
8. Procédé suivant la revendication 7, caractérisé en ce que l'on emploie comme polyols des poly-éther-ols.
EP79104409A 1978-11-22 1979-11-09 Procédé pour la fabrication de matières plastiques expansées renforcées Expired EP0011751B1 (fr)

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DE19782850610 DE2850610A1 (de) 1978-11-22 1978-11-22 Verfahren zur herstellung von verstaerkten geschaeumten kunststoffen
DE2850610 1978-11-22

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EP0011751B1 true EP0011751B1 (fr) 1984-03-14

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CA1120648A (fr) 1982-03-23
DE2850610A1 (de) 1980-06-12
US4243755A (en) 1981-01-06
DE2966801D1 (en) 1984-04-19
EP0011751A1 (fr) 1980-06-11

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